What the job involves
This page covers the electrical side of a hot water replacement and nothing else. In general terms, that means:
- Isolating the power to the old system
- Disconnecting the old unit's electrical connection so it can be removed
- Connecting the new unit to the electrical supply
- Replacing the isolator switch beside the unit if it is damaged, worn or doesn't suit the new system
- Restoring power and checking the new unit switches on
Many hot water systems sit outside, so the isolator and the cabling near the unit live with sun and rain. We look at the visible parts of it while we are there and will tell you if anything needs attention.
When people call
- An electric hot water system is being replaced and the new one needs connecting
- The water has gone cold and they aren't sure whether the problem is the unit or the power to it
- The isolator switch next to the unit is cracked, faded or damaged
- A renovation is moving things around and the hot water connection has to change with it
If the hot water has stopped and you suspect the electrics, don't open the unit's covers or the isolator to look. Electrical work in Queensland must be done by a licensed electrician, and DIY electrical work is illegal. Call and describe what has happened.
What you need to know
Hot water work is booked like everything else P4 does: Monday to Friday, 7am to 5pm. After-hours work can't be promised, so if the hot water fails on a Friday evening, it may be the next weekday before P4 can come.
It helps to have the make and model of the new system when you ask for a quote, along with a photo of the old unit and the isolator switch beside it.
What you get
- 12 months workmanship warranty, plus the manufacturer's warranty on products
- An invoice and a certificate for the electrical work
Our services come with guarantees that cannot be excluded under the Australian Consumer Law.
The hot water system's own warranty comes from its manufacturer.


